-75.76% is the change from 66 to 16
Calculation steps:
[( 16 - 66 ) ÷ 66] x 100 = -75.76%
Formula
Percentage change = [(16 - 66) / 66] x 100
Subtract the new number by the original number
16 - 66 = -50
-50 ÷ 66 = -0.7575757575757576
-0.7575757575757576 x 100 = -75.76%